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Is it necessary to change the rear differential oil?

1 Answers

Yvette

07/29/25 6:22pm

Rear differential oil needs to be replaced, with a typical replacement interval of 80,000-100,000 kilometers. Changing the differential oil prevents excessive wear of the vehicle's differential gears, which could lead to differential damage. Differential oil serves as the lubricant for the rear axle gear transmission mechanism, also known as gear oil. Its main functions are lubrication and cooling. Due to differences in the axial positions and tooth profiles of gears, there are significant variations in contact stress and relative sliding speed at the meshing surfaces. Therefore, different types of gear oil are required. Failure to replace differential oil increases friction between gears in the differential structure, raises vehicle fuel consumption, and over time can damage components like the differential and differential lock. The functions of differential oil include forming an oil film on gear meshing surfaces to provide lubrication, reducing friction resistance and extending component lifespan; and dissipating heat generated by friction pairs through fluid circulation for cooling purposes. Its working principle involves maintaining differential operation during high-speed driving when lubricant temperatures in the differential become extremely high, far exceeding engine oil temperatures, ensuring normal vehicle operation.

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